Is there reference manual for sh?

[perryh at pluto.rain.com]

> I need any online complete manual on sh, not a brief as it is man sh.
> The last one doesn't describe many features both interactive (command
> line editing, using history interactively, and many others) and
> scripting (for example, conditional expressions).

"info bash" might be a reasonably good approximation.  Granted it will
describe capabilities that may not be present in other variants of sh.